Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
  • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
  • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
  • H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
  • H04N21/4344—Remultiplexing of multiplex streams, e.g. by modifying time stamps or remapping the packet identifiers
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
  • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
  • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
  • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L27/00—Modulated-carrier systems
  • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
  • H04L27/14—Demodulator circuits; Receiver circuits
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
  • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
  • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
  • H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04H—BROADCAST COMMUNICATION
  • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
  • H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
  • H04H20/61—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for local area broadcast, e.g. instore broadcast
  • H04H20/63—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for local area broadcast, e.g. instore broadcast to plural spots in a confined site, e.g. MATV [Master Antenna Television]
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04H—BROADCAST COMMUNICATION
  • H04H40/00—Arrangements specially adapted for receiving broadcast information
  • H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
  • H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
  • H04H40/90—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for satellite broadcast receiving

Definitions

• the present invention relates to a converter and to a method for converting digital signals received in modulated and multiplexed form, in particular satellite signals.
• Digital signals received from satellites are generally processed on reception by a reduced noise power supply, designated by LNB (for “Low Noise Block converter” or “Low Noise Blockdown amplifier”) or by LNC (for “Low Noise Converter ”).
• LNB Low Noise Block converter
• LNC Low Noise Converter
• This block located at the focal point of a satellite receiving antenna, is intended to convert the received signals by frequency reduction and to amplify them, before sending them to other systems.
• digital video signals are conventionally sent then to an antenna input of a set-top box receiver or STB (for "Set Top Box”), where they are subject to a frequency selection by tuning (or "tuning") ).
• LNBs convert part of the signals received into Ku band (and potentially, Ka or C band) into the L band (950 MHz - 2150 MHz).
• this technique has drawbacks when several digital decoders (STBs) or other television reception systems are used in a house or a building served by the satellite antenna equipped with this type of LNB. Indeed: - a classic LNB can only convert one of the four Band / Polarization combinations associated with a program that one wishes to receive; if two or more STBs must simultaneously receive programs transmitted on different combinations, then more sophisticated LNBs must be used, with a system of distributors / switches, and with cabling which quickly becomes complex when the number of STBs increases; - the signal transmitted by the LNB is located in a frequency band which is not always well supported (significant attenuation) by the distribution network of conventional TV signals (cable or wireless) present in houses or apartments; we must therefore either provide a satellite signal distribution network different from the cable / wireless signal network, or install better quality cables allowing all these signals to pass simultaneously.
• STBs digital decoders
• US patent ⁇ 5,528,633 describes the combination of a radio frequency band tuner stage (also called a tuner) with a phase quadrature frequency conversion-down stage
• Downconverter quadrature in a single device.
• This device acts as an amplitude modulation tuner for transforming radio frequencies into a baseband, and is intended in particular to receive radio frequency signals from an LNB and convert them into signals in a desired digital format.
• the description specifies in particular that the digital data signals derived from any of the amplitude modulation formats can be supplied directly to a digital device as an output (col. 7, lines 41-44).
• This technique can be used to facilitate the adaptation of signals at the output of LNB, but it does not solve the difficulties linked to the presence of several STBs.
• WO-01/56297 relates to a home video distribution and storage system. It enables simultaneous wireless distribution of signals carrying satellite and Internet services to several televisions in a house.
• a master set-top box or STB (for “Set Top Box”) connected to external antennas provided with LNBs is provided for transmitting radio signals to TV receivers.
• the master STB includes from upstream to downstream a radio frequency (“RF") switch box, TV tuners, demodulators and demultiplexers for MPEG 2 (for "Moving Picture Experts Group”) or IP (for "Internet Protocol”) program streams "). It also includes a multiplexer of these streams for access to home TV receivers, via local antennas and slave STBs, as well as a converter to a wireless protocol, such as for example IEEE 802.11 or Hiperlan2.
• RF radio frequency
• the present invention provides a converter of digital satellite signals received in modulated and multiplexed form, which makes it possible to take into account several receivers simultaneously, in a manner which can be reliable and particularly economical.
• the signal converter of the invention can also be used for digital signals received over the air.
• the converter of the invention can also, in preferred embodiments, solve the problems of frequency acceptance downstream in a conventional TV signal distribution network.
• the invention also relates to a method for converting digital signals received, having the aforementioned advantages.
• the expression “converter” and “conversion” is understood here to mean broadly the transformation of digital signals from a first form into a second distinct form.
• the subject of the invention is a converter of digital signals received in modulated and multiplexed form, comprising means for selecting at least a part of these signals by adjusting at least a determined frequency and for demodulating these parts. , capable of producing at least one demodulated sub-signal.
• the converter also includes:
• the converter comprises a box containing all of the above means, as well as means for lowering the frequency of the digital signals received, upstream of the selection means.
• the converter unexpectedly integrates in the same housing intended for a lowering of frequency of signals, demultiplexing and remultiplexing means, which make it possible to select the desired programs, to combine them, and to produce at output, streams which not only condense the desired information but transmit it in a desired form, which can be adapted to a downstream network.
• the converter of the invention contrasts with existing systems, in which the frequency lowering functions are dissociated from the tuning, demodulation and demultiplexing functions.
• the first are integrated into LNBs while the second are implemented in an STB.
• the seconds are incorporated in terminals capable of directly processing the modulated and multiplexed signals received from LNBs.
• the converter of the invention goes against conventional wisdom, according to which the functions of frequency reduction are implemented in devices external to the houses and exposed to the bad weather, while the functions of tuning, demodulation and demultiplexing are grouped in more sophisticated devices in signal processing and used indoors, such as STBs.
• the invention is particularly advantageous in that it can considerably reduce the cabling required and avoid requiring RF transmissions internally, and is therefore capable of significantly reducing costs.
• the selection and demodulation means are advantageously capable of carrying out “adjustment at at least one determined frequency” thanks to the presence of one or more tuners.
• they comprise a tuner which makes it possible to successively select desired frequencies.
• they include several tuners in parallel, coupled with overhead sampling and digital signal processing for channel selection downstream. This last realization can allow in particular to receive several channels located at different frequencies in a given frequency band and to extract these channels in parallel.
• the protocol used for the remultiplexed flows is advantageously a communication protocol to a digital network.
• this preferred form amounts to repatriating into this LNB part of the functionalities usually found in an STB, so as to broadcast at the output of this LNB a digital signal in a standard used for example in the PC world.
• IP Internet terminals
• ADSL Analog Subscriber one
• the communication protocol is chosen from the Ethernet standards, IEEE1394 (for "I ⁇ stitute of Electrical and Electronic Engineers"), IEEE802.11a, Hiperlan2 and a communication protocol by carrier current online.
• a first version for which a cable is required to transmit the data we can notably rely on the Ethernet standard (10, 100 or 1000 base T, for example) or on a carrier current standard (Powerli ⁇ e) to constitute the network.
• IEEE802.11a or IEEE802.11e standards are good candidates.
• IP for “Internet Protocol”.
• Other similar standards can, of course, be used.
• IEEE802.11a / IP in the "wireless" version is Hiperlan2 / 1EEE1394.
• the converter is intended to convert signals digital transmitted by satellite.
• the converter is then preferably integrated into an LNB.
• signals transmitted by hertzian way being able in particular to include a local multipoint telecommunication system or STML (in English: LMDS, for “Local Multipoint Distribution System”) or a hertzian system of distribution multipoint or SDM (in English: MMDS, for “Microwave Multipoint Distribution System”).
• the converter is capable of processing both LMDS / MMDS satellite and radio signals.
• the converter comprises means for receiving other digital signals received in modulated and multiplexed form and chosen from signals transmitted by cable and signals transmitted by terrestrial way in the VHF / UHF band, the means of selection, demultiplexing, remultiplexing and transformation being intended to be applied also to these other signals.
• the converter is thus able to receive at least one other type of digital signal not requiring frequency reduction, and to apply to them the selection operations by frequency adjustment, demodulation, demultiplexing, remultiplexing and transformation, as for the associated signals.
• a frequency reduction in particular satellite and / or radio LMDS and / or MMDS.
• the converter is then provided with at least two inputs associated respectively with the two types of signals (respectively associated and not associated with a lowering of frequency).
• UHF VHF UHF / VHF band
• DVB-T Digital Video Broadcasting - Terrestrial
• the selection and demodulation means are provided for selecting and demodulating digital transmission channels so as to produce the sub-signals.
• These channels are typically selected from the set of channels available on a set of polarization and band combinations.
• an LNB of the “Quattro” type is advantageously used for this purpose, which is designed to provide the four conventional polarization / band combinations (vertical or horizontal polarization, high or low band).
• the demultiplexing means are preferably provided for extracting audiovisual programs, constituting at least some of the portions.
• the remultiplexing means are then advantageously capable of remultiplexing these portions into MPEG transport trains constituting the remultiplexed flows.
• the number of transport trains thus created depends on the number of different programs that are simultaneously viewed or recorded. If this number is small enough (typically less than 8), a single multiplex may suffice.
• This remultiplexing operation can be accompanied by a modification of the transport packets: it may indeed be desirable to modify for example the value of certain fields of identification of packets (“PIDs” for “Packets Identifiers”) or that of certain clock reference fields (“PCRs” for “Program Clock References”).
• the converter also comprises means for extracting transmission information received from the recipient receivers, and the transformation means are capable of determining the transmission criteria based on this transmission information.
• the converter is thus able to adapt the nature of the output signals according to the types of the receiving devices or of the network to which they belong.
• the converter also comprises means for extracting extraction information received from the destination receivers, and the transformation means are capable of determining the sub-signals and the portions as a function of this information. extraction. In this way, the converter is able to adapt to the demands of the receivers, and in particular to transmit the desired programs to them.
• coming from the receivers means not only messages sent directly by these receivers, but also messages transmitted by one or more entities of a local network to which these receivers are linked.
• the information indicated above is not obtained from information communicated by the destination receivers, but is either predetermined, either set by an operator independent of the receivers and their local home network.
• the converter also comprises means for modulating return signals from the destination receivers. It can thus, in particular, simplify the feedback of information in the case of a satellite return channel (bidirectional LNB).
• An advantage significant of such an embodiment is that it authorizes identical destination receivers (in particular STBs), whether a return path to an operator is provided or not. Modulation functions usually designed to be integrated in receivers with return path to operator are in fact incorporated in the converter. It is sufficient that the receivers are provided with local interactivity capacities, that is to say have an uplink communication channel towards the converter.
• the converter is able to modulate the return signals according to at least two distinct types of modulation.
• Such a versatile converter is capable of adapting to several return transmission channels, for example the satellite and the radio channel, depending on the mode of use which is made of them.
• the invention also relates to a method for converting digital signals received in modulated and multiplexed form, in which a frequency reduction of the received signals is carried out, at least part of these signals are selected by adjustment to at least one determined frequency and these parts are demodulated so as to produce at least one demodulated sub-signal.
• This conversion process includes steps of:
• This conversion process is preferably implemented by means of a converter according to any one of the embodiments of the invention.
• FIG. 1 is a block diagram of a set of transmitting signals to a transmission network, transforming the signals received by a converter according to the invention and transmitting flows from the converter to receivers a local network;
• FIG. 2 shows schematically in the form of functional blocks the converter of Figure 1;
• FIG. 3 shows a first application of the converter of Figures 1 and 2, to an LNB associated with a cable network;
• FIG. 4 shows a second application of the converter of Figures 1 and 2, to an LNB associated with a wireless network
• FIG. 5 shows a third application of the converter of Figures 1 and 2, to three LNBs associated jointly with a cable network;
• FIG. 6 schematically illustrates the integration of the converter of Figures 1 and 2 in an LNB, for example for one of the embodiments of Figures 3 to 5;
• FIG 7 shows in the form of functional blocks a
• modules represented are functional units, which may or may not correspond to physically distinguishable units.
• these modules or some of them can be grouped in a single component, or constitute functionalities of the same software.
• some modules may possibly be composed of separate physical entities.
• a transmitter 2 ( Figure 1) sends by general broadcast (called “broadcasting") broadcast signals 11 in modulated and multiplexed form to receivers R1, R2 ... Rn, via a transmission network 5 which is for example a network satellite or cable.
• the broadcast signals 11 are received by a signal converter 1 associated with a local network 6, connecting the receivers R1-Rn.
• This converter 1 has the function of transforming the signals 11 so as to produce flows 15 adapted to the local network 6 and to the receivers R1-Rn, as a function in particular of control information 16 transmitted by these receivers or by entities of the local network 6.
• the receivers R1-Rn are capable of communicating to the transmitter 2 of the return signals via the converter 1 - or to another system, such as for example a service operator. These return signals are sent as uplink communication signals 17 to converter 1, then transformed by converter 1 into modulated return signals 18, which are then relayed to transmitter 2.
• the converter 1 comprises a frequency lowering module 41 and a tuning and demodulation selection module 21 applied to the signals 11 received, intended to produce sub-signals 12, for example extracted from channels of 'emission determined.
• the converter 1 also includes a demultiplexing module 22 capable of extracting portions 13 of these sub-signals 12, typically consisting of audiovisual programs.
• a remultiplexing module 23 has the function of multiplexing these portions 13 into one or more remultiplexed streams 14, which may consist of one or more MPEG transport trains.
• a transformation module 24 is responsible for modifying these remultiplexed flows 14 in accordance with determined criteria for transmission to the receivers R1-Rn, for example according to a communication protocol adapted to the local network 6. The adapted flows 15 thus produced at the output of the module 24 are sent to the R1 -Rn receptors.
• the converter 1 also has a determination module
• control parameters provided for extracting from the control information 16 communicated by the local network 6 (in particular by the receivers R1-Rn), control parameters intended to govern the functions implemented in the converter 1: protocol to be implemented vis-à-vis the local network 6, types of sub-signals and portions to be extracted, etc.
• a modulation module 27 present in the converter 1 also processes the uplink communication signals 17, so as to produce the modulated return signals 18.
• a frequency elevation module 42 prepares these signals before transmission.
• a control unit 26 oversees the operation of all the modules of the converter 1.
• the converter 1 being integrated in an LNB.
• the converter 1 can be considered either as constituting the LNB itself, or appearing as a box containing the functional modules described above and incorporated into the LNB.
• a satellite antenna 50A provided with an LNB with converter 1A is connected to a wired local network 6A based on the Ethernet 100 Base T standard (hereinafter “100BT” for simplify) and having a pivot station 7A ("100BT hub").
• This station serves various receiving devices R1A, R2A ... R7A such as STBs, television, PC, printer and ADSL modem.
• the converter 1A of the LNB, wired to the pivot station 7A, is capable of transforming the satellite signals 11 received by directly producing the adapted flows 15 according to the Ethernet standard 100BT.
• a satellite antenna 50B provided with an LNB with converter 1B is provided for transmitting to a wireless local area network 6B based on the IEEE802.11a standard.
• This station serves various receiving devices R1B, R2B ... R6B such as STBs, PC, printer and ADSL modem.
• the converter 1 B of the LNB is capable of transforming the satellite signals 11 received by directly producing the adapted flows 15 according to the IEEE802.11a standard.
• three satellite antennas 50C, 50C and SOC are connected to a wired local network 6C based on the Ethernet standard 100BT and having a pivot station 7C.
• This station serves various R1C, R2C ... R6C receiving devices such as STBs, television, PC and printer.
• Each of the converters 1C, 1C and 1C ", wired to the pivot station 7C is capable of transforming the satellite signals 11 received by directly producing the adapted flows 15 according to the Ethernet 100BT standard.
• the taking into account of several antennas thus makes it possible to support multiple packages for the 6C network
• the described embodiment allows a simplification of the installation, by eliminating the signal distribution and switching accessories necessary in a conventional installation.
• An LNB 51 containing the converter 1 (FIG. 6) comprises, within the converter 1, a module 31 for separating combinations of the signals 11 received.
• This separation module 31 is capable of providing, for example, the four polarization / band combinations, the LNB being of the Quattro type, and of transmitting them to the selection and demodulation module 21. It is also provided for carrying out a frequency reduction and amplification of the received signals.
• the selection and demodulation module 21 consists of a multichannel tuner / demodulator, which makes it possible to select and demodulate m determined digital satellite channels from among all the channels available on the four polarization / combinations bandaged.
• a demultiplexing and remultiplexing unit 28 which groups the demultiplexing 22 and demultiplexing modules 23, extracts from the m demodulated channels the programs that the viewer (s) wish (s) to watch or record, and remultiplex these channels, for example into p MPEG transport trains (the “multiplexes”).
• a network interface 29 of the converter 1, including the transformation 24 and determination 25 control parameter modules, is responsible for encapsulating these p multiplexes in transmission frames of the chosen communication protocol (for example IP and Ethernet 100BT or IEEE802 .11a).
• This network interface 29 also extracts control information 16 received from the various devices present on the network 6, that which is necessary to determine the requesting devices, as well as the channels and programs which must be demodulated. This information is used to fill in the recipient fields of the transmission frames and to control by means of the control unit 26 via a control bus, the tuner / demodulator 21 and the multiplexer / demultiplexer (unit 28).
• the network interface 29 has the additional function of recovering the data to be transmitted (uplink communication signals 17) and of transmitting them to the modulation module 27.
• the converter 1 also comprises a transposition and amplification module 32, provided for processing the modulated return signals 18 transmitted by the modulation module 27, before their return sending by satellite.
• a suitable STB 60 (FIG. 7) corresponding to the LNB 51 comprises a network interface 62 intended to receive the adapted flows 15 coming from the converter 1, that is to say responding to a communication protocol on the local network (for example Ethernet 100BT or IEEE802.11a).
• the STB 60 also includes a set 61 of conventional functions including a demultiplexer module 63, an audio / video decoder 64, an external interface 65 for television and a processor 66 controlling these various entities via a control bus.
• the STB 60 is therefore identical to a conventional satellite STB with the exception of its front end for satellite reception (tuner and demodulator), replaced here by the network interface 62 making it possible to receive the data present on the network used.
• the interface 62 and the processor 66 are adapted to transmit to the LNB 51 presence information, as well as possibly data relating to the identity of the communication protocol used.
• the STB 60 sends this information on request from converter 1 (this request can in particular be triggered by an operator during an initialization or update phase, or be triggered periodically automatically) .
• the STB 60 is designed to trigger the sending of this information on each connection to a network, and to send an end of presence signal on each disconnection.
• no satellite return channel is provided, so that the LNB does not include modules 27 and 32.
• LNB 51 and STB 60 are detailed below for LNB 51 and STB 60 (suffix "D"). To simplify the presentation, the parts of LNB 51 D and STB 60D relating to the satellite return channel are not shown or expanded in the comments.
• the LNB 51 D ( Figure 8) includes within the 1 D converter the separation module 31 D delivering the four polarization / band combinations (LNB Quattro), in the form of four BIS signals (for "Intermediate Satellite Band”; in English IF for "Interm ⁇ diate Frequencies") in the frequency band 950 MHz - 2150 MHz.
• the selection and demodulation module 21 (referenced 21 D) comprises a switching matrix 33, which makes it possible to orient any of these four signals towards a set of m tuners T1, T2 ... Tm and respectively associated demodulators DMD1, DMD2 ... DMDm.
• Ti tuners are known tuners, delivering an analog signal which is then sampled and converted to digital by the first stages of the DMDi demodulators.
• these m isolated Ti tuners are replaced by a digital tuner, which samples the BIS signals very early and digitally performs all the filtering and transposition operations to supply the m signals to be demodulated.
• the demultiplexing and remultiplexing unit 28 (referenced
• the m demodulation and demultiplexing operations are those commonly found in satellite STBs.
• the function of m DMDi demodulators and DMXi demultiplexers is to process the signals according to the transmission standard used (for example DVB-S in Europe - for “Digital Video Broadcasting - Satellite” and DSS in the USA - for “Digital Satellite System”) and to restore the data corresponding to the programs that viewers connected to the local network 6 wish to watch or record.
• the remultiplexing unit 23D makes it possible to remultiplex the m programs restored in p streams (for example transport trains or “Transport Streams” for the MPEG standard), which can optionally consist of a single stream, and present them to the 29D network interface.
• p streams for example transport trains or “Transport Streams” for the MPEG standard
• This network interface 29D successively comprises in the transmission chain:
• a device 34 for managing a high-level protocol such as, for example, IP
• an interface 35 for controlling access to the medium known as a MAC interface (for "Medium Access Control"), responsible for managing access to the transmission medium; this interface, which depends on the medium, is different for the wired version and the wireless version;
• a physical interface 36 provided for physically processing the signals present on the transmission medium and the nature of which depends on this medium; - and optionally in the case of a wireless link (for example with the IEEE802.11a protocol), a radio interface 37 responsible for operations associated with radio broadcasts (transposition, filtering, power control, gain control, etc.) .
• a processor 38 provided with its RAM memory (for “Ra ⁇ dom
• the detailed STB, referenced 60D differs from conventional satellite STBs by its network interface 62D, which replaces the front end for satellite reception (tuner and demodulator).
• This network interface 62D successively comprises in the transmission chain: optionally, in the case where the local network 6 is of the wireless type, a radio interface 67; a physical interface 68, physically processing the signals present on the interface; this interface 68 depends on the transmission medium used and is different for the wired version and the wireless version; - a MAC 69 interface, providing an access layer to the transmission medium; this interface 69 also depends on the transmission medium;
• a layer 70 of high level protocol for example IP.
• the converter 1 is capable of processing radio signals (in particular MMDS / LMDS), instead of or in addition to satellite signals.

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• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Multimedia (AREA)
• Computer Networks & Wireless Communication (AREA)
• Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
• Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
• Superheterodyne Receivers (AREA)
• Radio Relay Systems (AREA)
• Time-Division Multiplex Systems (AREA)
• Small-Scale Networks (AREA)
• Communication Control (AREA)

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• 2003
  • 2003-04-17 FR FR0304801A patent/FR2854015A1/fr active Pending
• 2004
  • 2004-04-16 JP JP2006505557A patent/JP2006523978A/ja active Pending
  • 2004-04-16 EP EP04727910A patent/EP1614295A1/de not_active Withdrawn
  • 2004-04-16 US US10/553,539 patent/US20060262222A1/en not_active Abandoned
  • 2004-04-16 KR KR1020057019611A patent/KR20060004671A/ko not_active Application Discontinuation
  • 2004-04-16 MX MXPA05010963A patent/MXPA05010963A/es not_active Application Discontinuation
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  • 2004-04-16 CN CNA2004800095044A patent/CN1771733A/zh active Pending
  • 2004-04-16 WO PCT/EP2004/050537 patent/WO2004093455A1/fr active Application Filing
  • 2004-04-16 WO PCT/EP2004/050536 patent/WO2004093454A1/fr active Application Filing
  • 2004-04-16 KR KR1020057019612A patent/KR20060004672A/ko not_active Application Discontinuation
  • 2004-04-16 EP EP04741460A patent/EP1614296A1/de not_active Withdrawn

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